Strange sounds are happening all over the world. One part airplane flyover, two parts Inception BAHHH! with a dash of wind wooosh for good measure. The clip above is from Budapest, Hungary last week. There are clips from all over the world in the io9 link below.

Some are even calling it the end of the world. The sound of the seventh seal breaking and hell coming to infest Earth.

If it is a farce, it’s a pretty clever one. All you have to do is take footage of the air and layer in the audio. If you really want to sell it, get some people looking up in the air. Or, if you insist on pulling out all the stops, have someone mention there is a strange sounds outside. For “video proof” it’s about as low tech as you get.